Magnetic recording medium comprising a non magnetic underlayer and two magnetic layers of specified composition and thickness
US5405679A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Nov 8, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/25
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium is disclosed, which comprises a no-magnetic support having thereon, at least two magnetic layer including a first magnetic layer provided at the farthest position from the support, and a second magnetic layer provided between the first magnetic layer and the support, and a non-magnetic layer provided between the second magnetic layer and the support. In the above, at least one of the magnetic layers comprises a ferromagnetic metal powder. The magnetic layers have a thickness of not thicker than 0.3 .mu.m in total, and the non-magnetic layer has a thickness within the range of from, 0.2 .mu.m to 2.0 .mu.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.